2 * drivers/base/power/wakeup.c - System wakeup events framework
4 * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file is released under the GPLv2.
9 #include <linux/device.h>
10 #include <linux/slab.h>
11 #include <linux/sched/signal.h>
12 #include <linux/capability.h>
13 #include <linux/export.h>
14 #include <linux/suspend.h>
15 #include <linux/seq_file.h>
16 #include <linux/debugfs.h>
17 #include <linux/pm_wakeirq.h>
18 #include <trace/events/power.h>
23 * If set, the suspend/hibernate code will abort transitions to a sleep state
24 * if wakeup events are registered during or immediately before the transition.
26 bool events_check_enabled __read_mostly
;
28 /* First wakeup IRQ seen by the kernel in the last cycle. */
29 unsigned int pm_wakeup_irq __read_mostly
;
31 /* If greater than 0 and the system is suspending, terminate the suspend. */
32 static atomic_t pm_abort_suspend __read_mostly
;
35 * Combined counters of registered wakeup events and wakeup events in progress.
36 * They need to be modified together atomically, so it's better to use one
37 * atomic variable to hold them both.
39 static atomic_t combined_event_count
= ATOMIC_INIT(0);
41 #define IN_PROGRESS_BITS (sizeof(int) * 4)
42 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
44 static void split_counters(unsigned int *cnt
, unsigned int *inpr
)
46 unsigned int comb
= atomic_read(&combined_event_count
);
48 *cnt
= (comb
>> IN_PROGRESS_BITS
);
49 *inpr
= comb
& MAX_IN_PROGRESS
;
52 /* A preserved old value of the events counter. */
53 static unsigned int saved_count
;
55 static DEFINE_SPINLOCK(events_lock
);
57 static void pm_wakeup_timer_fn(unsigned long data
);
59 static LIST_HEAD(wakeup_sources
);
61 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue
);
63 static struct wakeup_source deleted_ws
= {
65 .lock
= __SPIN_LOCK_UNLOCKED(deleted_ws
.lock
),
69 * wakeup_source_prepare - Prepare a new wakeup source for initialization.
70 * @ws: Wakeup source to prepare.
71 * @name: Pointer to the name of the new wakeup source.
73 * Callers must ensure that the @name string won't be freed when @ws is still in
76 void wakeup_source_prepare(struct wakeup_source
*ws
, const char *name
)
79 memset(ws
, 0, sizeof(*ws
));
83 EXPORT_SYMBOL_GPL(wakeup_source_prepare
);
86 * wakeup_source_create - Create a struct wakeup_source object.
87 * @name: Name of the new wakeup source.
89 struct wakeup_source
*wakeup_source_create(const char *name
)
91 struct wakeup_source
*ws
;
93 ws
= kmalloc(sizeof(*ws
), GFP_KERNEL
);
97 wakeup_source_prepare(ws
, name
? kstrdup_const(name
, GFP_KERNEL
) : NULL
);
100 EXPORT_SYMBOL_GPL(wakeup_source_create
);
103 * wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
104 * @ws: Wakeup source to prepare for destruction.
106 * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
107 * be run in parallel with this function for the same wakeup source object.
109 void wakeup_source_drop(struct wakeup_source
*ws
)
114 del_timer_sync(&ws
->timer
);
117 EXPORT_SYMBOL_GPL(wakeup_source_drop
);
120 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
122 static void wakeup_source_record(struct wakeup_source
*ws
)
126 spin_lock_irqsave(&deleted_ws
.lock
, flags
);
128 if (ws
->event_count
) {
129 deleted_ws
.total_time
=
130 ktime_add(deleted_ws
.total_time
, ws
->total_time
);
131 deleted_ws
.prevent_sleep_time
=
132 ktime_add(deleted_ws
.prevent_sleep_time
,
133 ws
->prevent_sleep_time
);
134 deleted_ws
.max_time
=
135 ktime_compare(deleted_ws
.max_time
, ws
->max_time
) > 0 ?
136 deleted_ws
.max_time
: ws
->max_time
;
137 deleted_ws
.event_count
+= ws
->event_count
;
138 deleted_ws
.active_count
+= ws
->active_count
;
139 deleted_ws
.relax_count
+= ws
->relax_count
;
140 deleted_ws
.expire_count
+= ws
->expire_count
;
141 deleted_ws
.wakeup_count
+= ws
->wakeup_count
;
144 spin_unlock_irqrestore(&deleted_ws
.lock
, flags
);
148 * wakeup_source_destroy - Destroy a struct wakeup_source object.
149 * @ws: Wakeup source to destroy.
151 * Use only for wakeup source objects created with wakeup_source_create().
153 void wakeup_source_destroy(struct wakeup_source
*ws
)
158 wakeup_source_drop(ws
);
159 wakeup_source_record(ws
);
160 kfree_const(ws
->name
);
163 EXPORT_SYMBOL_GPL(wakeup_source_destroy
);
166 * wakeup_source_add - Add given object to the list of wakeup sources.
167 * @ws: Wakeup source object to add to the list.
169 void wakeup_source_add(struct wakeup_source
*ws
)
176 spin_lock_init(&ws
->lock
);
177 setup_timer(&ws
->timer
, pm_wakeup_timer_fn
, (unsigned long)ws
);
179 ws
->last_time
= ktime_get();
181 spin_lock_irqsave(&events_lock
, flags
);
182 list_add_rcu(&ws
->entry
, &wakeup_sources
);
183 spin_unlock_irqrestore(&events_lock
, flags
);
185 EXPORT_SYMBOL_GPL(wakeup_source_add
);
188 * wakeup_source_remove - Remove given object from the wakeup sources list.
189 * @ws: Wakeup source object to remove from the list.
191 void wakeup_source_remove(struct wakeup_source
*ws
)
198 spin_lock_irqsave(&events_lock
, flags
);
199 list_del_rcu(&ws
->entry
);
200 spin_unlock_irqrestore(&events_lock
, flags
);
203 EXPORT_SYMBOL_GPL(wakeup_source_remove
);
206 * wakeup_source_register - Create wakeup source and add it to the list.
207 * @name: Name of the wakeup source to register.
209 struct wakeup_source
*wakeup_source_register(const char *name
)
211 struct wakeup_source
*ws
;
213 ws
= wakeup_source_create(name
);
215 wakeup_source_add(ws
);
219 EXPORT_SYMBOL_GPL(wakeup_source_register
);
222 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
223 * @ws: Wakeup source object to unregister.
225 void wakeup_source_unregister(struct wakeup_source
*ws
)
228 wakeup_source_remove(ws
);
229 wakeup_source_destroy(ws
);
232 EXPORT_SYMBOL_GPL(wakeup_source_unregister
);
235 * device_wakeup_attach - Attach a wakeup source object to a device object.
236 * @dev: Device to handle.
237 * @ws: Wakeup source object to attach to @dev.
239 * This causes @dev to be treated as a wakeup device.
241 static int device_wakeup_attach(struct device
*dev
, struct wakeup_source
*ws
)
243 spin_lock_irq(&dev
->power
.lock
);
244 if (dev
->power
.wakeup
) {
245 spin_unlock_irq(&dev
->power
.lock
);
248 dev
->power
.wakeup
= ws
;
249 if (dev
->power
.wakeirq
)
250 device_wakeup_attach_irq(dev
, dev
->power
.wakeirq
);
251 spin_unlock_irq(&dev
->power
.lock
);
256 * device_wakeup_enable - Enable given device to be a wakeup source.
257 * @dev: Device to handle.
259 * Create a wakeup source object, register it and attach it to @dev.
261 int device_wakeup_enable(struct device
*dev
)
263 struct wakeup_source
*ws
;
266 if (!dev
|| !dev
->power
.can_wakeup
)
269 ws
= wakeup_source_register(dev_name(dev
));
273 ret
= device_wakeup_attach(dev
, ws
);
275 wakeup_source_unregister(ws
);
279 EXPORT_SYMBOL_GPL(device_wakeup_enable
);
282 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
283 * @dev: Device to handle
284 * @wakeirq: Device specific wakeirq entry
286 * Attach a device wakeirq to the wakeup source so the device
287 * wake IRQ can be configured automatically for suspend and
290 * Call under the device's power.lock lock.
292 int device_wakeup_attach_irq(struct device
*dev
,
293 struct wake_irq
*wakeirq
)
295 struct wakeup_source
*ws
;
297 ws
= dev
->power
.wakeup
;
299 dev_err(dev
, "forgot to call call device_init_wakeup?\n");
306 ws
->wakeirq
= wakeirq
;
311 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
312 * @dev: Device to handle
314 * Removes a device wakeirq from the wakeup source.
316 * Call under the device's power.lock lock.
318 void device_wakeup_detach_irq(struct device
*dev
)
320 struct wakeup_source
*ws
;
322 ws
= dev
->power
.wakeup
;
328 * device_wakeup_arm_wake_irqs(void)
330 * Itereates over the list of device wakeirqs to arm them.
332 void device_wakeup_arm_wake_irqs(void)
334 struct wakeup_source
*ws
;
337 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
)
338 dev_pm_arm_wake_irq(ws
->wakeirq
);
344 * device_wakeup_disarm_wake_irqs(void)
346 * Itereates over the list of device wakeirqs to disarm them.
348 void device_wakeup_disarm_wake_irqs(void)
350 struct wakeup_source
*ws
;
353 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
)
354 dev_pm_disarm_wake_irq(ws
->wakeirq
);
360 * device_wakeup_detach - Detach a device's wakeup source object from it.
361 * @dev: Device to detach the wakeup source object from.
363 * After it returns, @dev will not be treated as a wakeup device any more.
365 static struct wakeup_source
*device_wakeup_detach(struct device
*dev
)
367 struct wakeup_source
*ws
;
369 spin_lock_irq(&dev
->power
.lock
);
370 ws
= dev
->power
.wakeup
;
371 dev
->power
.wakeup
= NULL
;
372 spin_unlock_irq(&dev
->power
.lock
);
377 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
378 * @dev: Device to handle.
380 * Detach the @dev's wakeup source object from it, unregister this wakeup source
381 * object and destroy it.
383 int device_wakeup_disable(struct device
*dev
)
385 struct wakeup_source
*ws
;
387 if (!dev
|| !dev
->power
.can_wakeup
)
390 ws
= device_wakeup_detach(dev
);
391 wakeup_source_unregister(ws
);
394 EXPORT_SYMBOL_GPL(device_wakeup_disable
);
397 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
398 * @dev: Device to handle.
399 * @capable: Whether or not @dev is capable of waking up the system from sleep.
401 * If @capable is set, set the @dev's power.can_wakeup flag and add its
402 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
403 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
405 * This function may sleep and it can't be called from any context where
406 * sleeping is not allowed.
408 void device_set_wakeup_capable(struct device
*dev
, bool capable
)
410 if (!!dev
->power
.can_wakeup
== !!capable
)
413 if (device_is_registered(dev
) && !list_empty(&dev
->power
.entry
)) {
415 if (wakeup_sysfs_add(dev
))
418 wakeup_sysfs_remove(dev
);
421 dev
->power
.can_wakeup
= capable
;
423 EXPORT_SYMBOL_GPL(device_set_wakeup_capable
);
426 * device_init_wakeup - Device wakeup initialization.
427 * @dev: Device to handle.
428 * @enable: Whether or not to enable @dev as a wakeup device.
430 * By default, most devices should leave wakeup disabled. The exceptions are
431 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
432 * possibly network interfaces, etc. Also, devices that don't generate their
433 * own wakeup requests but merely forward requests from one bus to another
434 * (like PCI bridges) should have wakeup enabled by default.
436 int device_init_wakeup(struct device
*dev
, bool enable
)
444 device_set_wakeup_capable(dev
, true);
445 ret
= device_wakeup_enable(dev
);
447 if (dev
->power
.can_wakeup
)
448 device_wakeup_disable(dev
);
450 device_set_wakeup_capable(dev
, false);
455 EXPORT_SYMBOL_GPL(device_init_wakeup
);
458 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
459 * @dev: Device to handle.
461 int device_set_wakeup_enable(struct device
*dev
, bool enable
)
463 if (!dev
|| !dev
->power
.can_wakeup
)
466 return enable
? device_wakeup_enable(dev
) : device_wakeup_disable(dev
);
468 EXPORT_SYMBOL_GPL(device_set_wakeup_enable
);
471 * wakeup_source_not_registered - validate the given wakeup source.
472 * @ws: Wakeup source to be validated.
474 static bool wakeup_source_not_registered(struct wakeup_source
*ws
)
477 * Use timer struct to check if the given source is initialized
478 * by wakeup_source_add.
480 return ws
->timer
.function
!= pm_wakeup_timer_fn
||
481 ws
->timer
.data
!= (unsigned long)ws
;
485 * The functions below use the observation that each wakeup event starts a
486 * period in which the system should not be suspended. The moment this period
487 * will end depends on how the wakeup event is going to be processed after being
488 * detected and all of the possible cases can be divided into two distinct
491 * First, a wakeup event may be detected by the same functional unit that will
492 * carry out the entire processing of it and possibly will pass it to user space
493 * for further processing. In that case the functional unit that has detected
494 * the event may later "close" the "no suspend" period associated with it
495 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
496 * pm_relax(), balanced with each other, is supposed to be used in such
499 * Second, a wakeup event may be detected by one functional unit and processed
500 * by another one. In that case the unit that has detected it cannot really
501 * "close" the "no suspend" period associated with it, unless it knows in
502 * advance what's going to happen to the event during processing. This
503 * knowledge, however, may not be available to it, so it can simply specify time
504 * to wait before the system can be suspended and pass it as the second
505 * argument of pm_wakeup_event().
507 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
508 * "no suspend" period will be ended either by the pm_relax(), or by the timer
509 * function executed when the timer expires, whichever comes first.
513 * wakup_source_activate - Mark given wakeup source as active.
514 * @ws: Wakeup source to handle.
515 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
517 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
518 * core of the event by incrementing the counter of of wakeup events being
521 static void wakeup_source_activate(struct wakeup_source
*ws
, bool hard
)
525 if (WARN_ONCE(wakeup_source_not_registered(ws
),
526 "unregistered wakeup source\n"))
534 ws
->last_time
= ktime_get();
535 if (ws
->autosleep_enabled
)
536 ws
->start_prevent_time
= ws
->last_time
;
538 /* Increment the counter of events in progress. */
539 cec
= atomic_inc_return(&combined_event_count
);
541 trace_wakeup_source_activate(ws
->name
, cec
);
545 * wakeup_source_report_event - Report wakeup event using the given source.
546 * @ws: Wakeup source to report the event for.
547 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
549 static void wakeup_source_report_event(struct wakeup_source
*ws
, bool hard
)
552 /* This is racy, but the counter is approximate anyway. */
553 if (events_check_enabled
)
557 wakeup_source_activate(ws
, hard
);
561 * __pm_stay_awake - Notify the PM core of a wakeup event.
562 * @ws: Wakeup source object associated with the source of the event.
564 * It is safe to call this function from interrupt context.
566 void __pm_stay_awake(struct wakeup_source
*ws
)
573 spin_lock_irqsave(&ws
->lock
, flags
);
575 wakeup_source_report_event(ws
, false);
576 del_timer(&ws
->timer
);
577 ws
->timer_expires
= 0;
579 spin_unlock_irqrestore(&ws
->lock
, flags
);
581 EXPORT_SYMBOL_GPL(__pm_stay_awake
);
584 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
585 * @dev: Device the wakeup event is related to.
587 * Notify the PM core of a wakeup event (signaled by @dev) by calling
588 * __pm_stay_awake for the @dev's wakeup source object.
590 * Call this function after detecting of a wakeup event if pm_relax() is going
591 * to be called directly after processing the event (and possibly passing it to
592 * user space for further processing).
594 void pm_stay_awake(struct device
*dev
)
601 spin_lock_irqsave(&dev
->power
.lock
, flags
);
602 __pm_stay_awake(dev
->power
.wakeup
);
603 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
605 EXPORT_SYMBOL_GPL(pm_stay_awake
);
607 #ifdef CONFIG_PM_AUTOSLEEP
608 static void update_prevent_sleep_time(struct wakeup_source
*ws
, ktime_t now
)
610 ktime_t delta
= ktime_sub(now
, ws
->start_prevent_time
);
611 ws
->prevent_sleep_time
= ktime_add(ws
->prevent_sleep_time
, delta
);
614 static inline void update_prevent_sleep_time(struct wakeup_source
*ws
,
619 * wakup_source_deactivate - Mark given wakeup source as inactive.
620 * @ws: Wakeup source to handle.
622 * Update the @ws' statistics and notify the PM core that the wakeup source has
623 * become inactive by decrementing the counter of wakeup events being processed
624 * and incrementing the counter of registered wakeup events.
626 static void wakeup_source_deactivate(struct wakeup_source
*ws
)
628 unsigned int cnt
, inpr
, cec
;
634 * __pm_relax() may be called directly or from a timer function.
635 * If it is called directly right after the timer function has been
636 * started, but before the timer function calls __pm_relax(), it is
637 * possible that __pm_stay_awake() will be called in the meantime and
638 * will set ws->active. Then, ws->active may be cleared immediately
639 * by the __pm_relax() called from the timer function, but in such a
640 * case ws->relax_count will be different from ws->active_count.
642 if (ws
->relax_count
!= ws
->active_count
) {
650 duration
= ktime_sub(now
, ws
->last_time
);
651 ws
->total_time
= ktime_add(ws
->total_time
, duration
);
652 if (ktime_to_ns(duration
) > ktime_to_ns(ws
->max_time
))
653 ws
->max_time
= duration
;
656 del_timer(&ws
->timer
);
657 ws
->timer_expires
= 0;
659 if (ws
->autosleep_enabled
)
660 update_prevent_sleep_time(ws
, now
);
663 * Increment the counter of registered wakeup events and decrement the
664 * couter of wakeup events in progress simultaneously.
666 cec
= atomic_add_return(MAX_IN_PROGRESS
, &combined_event_count
);
667 trace_wakeup_source_deactivate(ws
->name
, cec
);
669 split_counters(&cnt
, &inpr
);
670 if (!inpr
&& waitqueue_active(&wakeup_count_wait_queue
))
671 wake_up(&wakeup_count_wait_queue
);
675 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
676 * @ws: Wakeup source object associated with the source of the event.
678 * Call this function for wakeup events whose processing started with calling
681 * It is safe to call it from interrupt context.
683 void __pm_relax(struct wakeup_source
*ws
)
690 spin_lock_irqsave(&ws
->lock
, flags
);
692 wakeup_source_deactivate(ws
);
693 spin_unlock_irqrestore(&ws
->lock
, flags
);
695 EXPORT_SYMBOL_GPL(__pm_relax
);
698 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
699 * @dev: Device that signaled the event.
701 * Execute __pm_relax() for the @dev's wakeup source object.
703 void pm_relax(struct device
*dev
)
710 spin_lock_irqsave(&dev
->power
.lock
, flags
);
711 __pm_relax(dev
->power
.wakeup
);
712 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
714 EXPORT_SYMBOL_GPL(pm_relax
);
717 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
718 * @data: Address of the wakeup source object associated with the event source.
720 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
721 * in @data if it is currently active and its timer has not been canceled and
722 * the expiration time of the timer is not in future.
724 static void pm_wakeup_timer_fn(unsigned long data
)
726 struct wakeup_source
*ws
= (struct wakeup_source
*)data
;
729 spin_lock_irqsave(&ws
->lock
, flags
);
731 if (ws
->active
&& ws
->timer_expires
732 && time_after_eq(jiffies
, ws
->timer_expires
)) {
733 wakeup_source_deactivate(ws
);
737 spin_unlock_irqrestore(&ws
->lock
, flags
);
741 * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
742 * @ws: Wakeup source object associated with the event source.
743 * @msec: Anticipated event processing time (in milliseconds).
744 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
746 * Notify the PM core of a wakeup event whose source is @ws that will take
747 * approximately @msec milliseconds to be processed by the kernel. If @ws is
748 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
749 * execute pm_wakeup_timer_fn() in future.
751 * It is safe to call this function from interrupt context.
753 void pm_wakeup_ws_event(struct wakeup_source
*ws
, unsigned int msec
, bool hard
)
756 unsigned long expires
;
761 spin_lock_irqsave(&ws
->lock
, flags
);
763 wakeup_source_report_event(ws
, hard
);
766 wakeup_source_deactivate(ws
);
770 expires
= jiffies
+ msecs_to_jiffies(msec
);
774 if (!ws
->timer_expires
|| time_after(expires
, ws
->timer_expires
)) {
775 mod_timer(&ws
->timer
, expires
);
776 ws
->timer_expires
= expires
;
780 spin_unlock_irqrestore(&ws
->lock
, flags
);
782 EXPORT_SYMBOL_GPL(pm_wakeup_ws_event
);
785 * pm_wakeup_event - Notify the PM core of a wakeup event.
786 * @dev: Device the wakeup event is related to.
787 * @msec: Anticipated event processing time (in milliseconds).
788 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
790 * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
792 void pm_wakeup_dev_event(struct device
*dev
, unsigned int msec
, bool hard
)
799 spin_lock_irqsave(&dev
->power
.lock
, flags
);
800 pm_wakeup_ws_event(dev
->power
.wakeup
, msec
, hard
);
801 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
803 EXPORT_SYMBOL_GPL(pm_wakeup_dev_event
);
805 void pm_print_active_wakeup_sources(void)
807 struct wakeup_source
*ws
;
809 struct wakeup_source
*last_activity_ws
= NULL
;
812 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
) {
814 pr_debug("active wakeup source: %s\n", ws
->name
);
816 } else if (!active
&&
817 (!last_activity_ws
||
818 ktime_to_ns(ws
->last_time
) >
819 ktime_to_ns(last_activity_ws
->last_time
))) {
820 last_activity_ws
= ws
;
824 if (!active
&& last_activity_ws
)
825 pr_debug("last active wakeup source: %s\n",
826 last_activity_ws
->name
);
829 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources
);
832 * pm_wakeup_pending - Check if power transition in progress should be aborted.
834 * Compare the current number of registered wakeup events with its preserved
835 * value from the past and return true if new wakeup events have been registered
836 * since the old value was stored. Also return true if the current number of
837 * wakeup events being processed is different from zero.
839 bool pm_wakeup_pending(void)
844 spin_lock_irqsave(&events_lock
, flags
);
845 if (events_check_enabled
) {
846 unsigned int cnt
, inpr
;
848 split_counters(&cnt
, &inpr
);
849 ret
= (cnt
!= saved_count
|| inpr
> 0);
850 events_check_enabled
= !ret
;
852 spin_unlock_irqrestore(&events_lock
, flags
);
855 pr_info("PM: Wakeup pending, aborting suspend\n");
856 pm_print_active_wakeup_sources();
859 return ret
|| atomic_read(&pm_abort_suspend
) > 0;
862 void pm_system_wakeup(void)
864 atomic_inc(&pm_abort_suspend
);
867 EXPORT_SYMBOL_GPL(pm_system_wakeup
);
869 void pm_system_cancel_wakeup(void)
871 atomic_dec(&pm_abort_suspend
);
874 void pm_wakeup_clear(bool reset
)
878 atomic_set(&pm_abort_suspend
, 0);
881 void pm_system_irq_wakeup(unsigned int irq_number
)
883 if (pm_wakeup_irq
== 0) {
884 pm_wakeup_irq
= irq_number
;
890 * pm_get_wakeup_count - Read the number of registered wakeup events.
891 * @count: Address to store the value at.
892 * @block: Whether or not to block.
894 * Store the number of registered wakeup events at the address in @count. If
895 * @block is set, block until the current number of wakeup events being
898 * Return 'false' if the current number of wakeup events being processed is
899 * nonzero. Otherwise return 'true'.
901 bool pm_get_wakeup_count(unsigned int *count
, bool block
)
903 unsigned int cnt
, inpr
;
909 prepare_to_wait(&wakeup_count_wait_queue
, &wait
,
911 split_counters(&cnt
, &inpr
);
912 if (inpr
== 0 || signal_pending(current
))
914 pm_print_active_wakeup_sources();
917 finish_wait(&wakeup_count_wait_queue
, &wait
);
920 split_counters(&cnt
, &inpr
);
926 * pm_save_wakeup_count - Save the current number of registered wakeup events.
927 * @count: Value to compare with the current number of registered wakeup events.
929 * If @count is equal to the current number of registered wakeup events and the
930 * current number of wakeup events being processed is zero, store @count as the
931 * old number of registered wakeup events for pm_check_wakeup_events(), enable
932 * wakeup events detection and return 'true'. Otherwise disable wakeup events
933 * detection and return 'false'.
935 bool pm_save_wakeup_count(unsigned int count
)
937 unsigned int cnt
, inpr
;
940 events_check_enabled
= false;
941 spin_lock_irqsave(&events_lock
, flags
);
942 split_counters(&cnt
, &inpr
);
943 if (cnt
== count
&& inpr
== 0) {
945 events_check_enabled
= true;
947 spin_unlock_irqrestore(&events_lock
, flags
);
948 return events_check_enabled
;
951 #ifdef CONFIG_PM_AUTOSLEEP
953 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
954 * @enabled: Whether to set or to clear the autosleep_enabled flags.
956 void pm_wakep_autosleep_enabled(bool set
)
958 struct wakeup_source
*ws
;
959 ktime_t now
= ktime_get();
962 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
) {
963 spin_lock_irq(&ws
->lock
);
964 if (ws
->autosleep_enabled
!= set
) {
965 ws
->autosleep_enabled
= set
;
968 ws
->start_prevent_time
= now
;
970 update_prevent_sleep_time(ws
, now
);
973 spin_unlock_irq(&ws
->lock
);
977 #endif /* CONFIG_PM_AUTOSLEEP */
979 static struct dentry
*wakeup_sources_stats_dentry
;
982 * print_wakeup_source_stats - Print wakeup source statistics information.
983 * @m: seq_file to print the statistics into.
984 * @ws: Wakeup source object to print the statistics for.
986 static int print_wakeup_source_stats(struct seq_file
*m
,
987 struct wakeup_source
*ws
)
992 unsigned long active_count
;
994 ktime_t prevent_sleep_time
;
996 spin_lock_irqsave(&ws
->lock
, flags
);
998 total_time
= ws
->total_time
;
999 max_time
= ws
->max_time
;
1000 prevent_sleep_time
= ws
->prevent_sleep_time
;
1001 active_count
= ws
->active_count
;
1003 ktime_t now
= ktime_get();
1005 active_time
= ktime_sub(now
, ws
->last_time
);
1006 total_time
= ktime_add(total_time
, active_time
);
1007 if (active_time
> max_time
)
1008 max_time
= active_time
;
1010 if (ws
->autosleep_enabled
)
1011 prevent_sleep_time
= ktime_add(prevent_sleep_time
,
1012 ktime_sub(now
, ws
->start_prevent_time
));
1017 seq_printf(m
, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n",
1018 ws
->name
, active_count
, ws
->event_count
,
1019 ws
->wakeup_count
, ws
->expire_count
,
1020 ktime_to_ms(active_time
), ktime_to_ms(total_time
),
1021 ktime_to_ms(max_time
), ktime_to_ms(ws
->last_time
),
1022 ktime_to_ms(prevent_sleep_time
));
1024 spin_unlock_irqrestore(&ws
->lock
, flags
);
1030 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1031 * @m: seq_file to print the statistics into.
1033 static int wakeup_sources_stats_show(struct seq_file
*m
, void *unused
)
1035 struct wakeup_source
*ws
;
1037 seq_puts(m
, "name\t\tactive_count\tevent_count\twakeup_count\t"
1038 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1039 "last_change\tprevent_suspend_time\n");
1042 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
)
1043 print_wakeup_source_stats(m
, ws
);
1046 print_wakeup_source_stats(m
, &deleted_ws
);
1051 static int wakeup_sources_stats_open(struct inode
*inode
, struct file
*file
)
1053 return single_open(file
, wakeup_sources_stats_show
, NULL
);
1056 static const struct file_operations wakeup_sources_stats_fops
= {
1057 .owner
= THIS_MODULE
,
1058 .open
= wakeup_sources_stats_open
,
1060 .llseek
= seq_lseek
,
1061 .release
= single_release
,
1064 static int __init
wakeup_sources_debugfs_init(void)
1066 wakeup_sources_stats_dentry
= debugfs_create_file("wakeup_sources",
1067 S_IRUGO
, NULL
, NULL
, &wakeup_sources_stats_fops
);
1071 postcore_initcall(wakeup_sources_debugfs_init
);